These word problems are unique in that they teach more than just math. Many are complete multi-subject lessons, and all of them adhere to the Common Core Standards pertaining to the indicated grade levels for all the subjects they cover. None of them require any extra materials. As well as math, these word problems teach mythology, science, social studies, music theory, and other subjects in the process of enhancing math, analysis, and critical thinking skills. Also, they are written to stretch the imagination, and many include original drawings as well as web links for additional information on the subjects being introduced.